Cassini/Altimeter and Vims Complementarity: Example Using Observations Over the Same Area From Ta and T13 Titan's Flybys
International audience The altimeter mode of the Ku-band RADAR experiment onboard the Cassini-Huygens mission has been designed primarily for the study of Titan's surface topography. Inspired by what is done on the Earth in icy contexts like in the Antarctic, Cassini altimetry data can also be...
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ftunivangershal:oai:HAL:hal-00405629v1 2024-04-28T07:56:09+00:00 Cassini/Altimeter and Vims Complementarity: Example Using Observations Over the Same Area From Ta and T13 Titan's Flybys Crapeau, M. Rodriguez, S. Le Mouelic, S. Paillou, Philippe Sotin, C. Wall, S. D. The Vims Science Team, The Radar Science Team Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux (L3AB) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Planétologie et Géodynamique UMR 6112 (LPG) Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Observatoire aquitain des sciences de l'univers (OASU) Laboratoire d'Astrophysique de Bordeaux Pessac (LAB) Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Jet Propulsion Laboratory (JPL) NASA-California Institute of Technology (CALTECH) 2006 https://hal.science/hal-00405629 en eng HAL CCSD hal-00405629 https://hal.science/hal-00405629 BIBCODE: 2006DPS.38.4806C 2006DPS.38.4806C - Bulletin of the American Astronomical Society American Astronomical Society, DPS meeting #38, #48.06; https://hal.science/hal-00405629 American Astronomical Society, DPS meeting #38, #48.06;, 2006, United States. pp.575 [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] info:eu-repo/semantics/conferenceObject Conference papers 2006 ftunivangershal 2024-04-05T02:22:52Z International audience The altimeter mode of the Ku-band RADAR experiment onboard the Cassini-Huygens mission has been designed primarily for the study of Titan's surface topography. Inspired by what is done on the Earth in icy contexts like in the Antarctic, Cassini altimetry data can also be used to retrieve the radar reflectivity of Titan's surface and thus, information about its nature. Our first study shows clear contrasts of the radar reflectivity along the altimeter track acquired during the first Titan flyby (Ta). This distinct decrease in radar reflectivity is somewhat correlated with a slight surface height variation. The 13th Titan flyby (T13) provided us VIMS (Visual and Infrared Mapping Spectrometer, operating between 0.3 and 5.1 µm) medium resolution observations of the same region. Infrared I/F along the Ta altimeter track presents a very strong correlation with the computed radar reflectivity. These correlations between infrared I/F and radar reflectivity variations indicate a change in the surface nature and the presence of a clearly defined surface structure under the track. VIMS 2.03/1.27 µm channels ratio transect along the altimeter track also suggests a local enrichment in water ice associated with a smooth depression, maybe witnessing ancient channels. Conference Object Antarc* Antarctic Portail des publications scientifiques de l’Université d’Angers (HAL) |
institution |
Open Polar |
collection |
Portail des publications scientifiques de l’Université d’Angers (HAL) |
op_collection_id |
ftunivangershal |
language |
English |
topic |
[SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] |
spellingShingle |
[SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] Crapeau, M. Rodriguez, S. Le Mouelic, S. Paillou, Philippe Sotin, C. Wall, S. D. The Vims Science Team, The Radar Science Team Cassini/Altimeter and Vims Complementarity: Example Using Observations Over the Same Area From Ta and T13 Titan's Flybys |
topic_facet |
[SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] |
description |
International audience The altimeter mode of the Ku-band RADAR experiment onboard the Cassini-Huygens mission has been designed primarily for the study of Titan's surface topography. Inspired by what is done on the Earth in icy contexts like in the Antarctic, Cassini altimetry data can also be used to retrieve the radar reflectivity of Titan's surface and thus, information about its nature. Our first study shows clear contrasts of the radar reflectivity along the altimeter track acquired during the first Titan flyby (Ta). This distinct decrease in radar reflectivity is somewhat correlated with a slight surface height variation. The 13th Titan flyby (T13) provided us VIMS (Visual and Infrared Mapping Spectrometer, operating between 0.3 and 5.1 µm) medium resolution observations of the same region. Infrared I/F along the Ta altimeter track presents a very strong correlation with the computed radar reflectivity. These correlations between infrared I/F and radar reflectivity variations indicate a change in the surface nature and the presence of a clearly defined surface structure under the track. VIMS 2.03/1.27 µm channels ratio transect along the altimeter track also suggests a local enrichment in water ice associated with a smooth depression, maybe witnessing ancient channels. |
author2 |
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux (L3AB) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Planétologie et Géodynamique UMR 6112 (LPG) Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Observatoire aquitain des sciences de l'univers (OASU) Laboratoire d'Astrophysique de Bordeaux Pessac (LAB) Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Jet Propulsion Laboratory (JPL) NASA-California Institute of Technology (CALTECH) |
format |
Conference Object |
author |
Crapeau, M. Rodriguez, S. Le Mouelic, S. Paillou, Philippe Sotin, C. Wall, S. D. The Vims Science Team, The Radar Science Team |
author_facet |
Crapeau, M. Rodriguez, S. Le Mouelic, S. Paillou, Philippe Sotin, C. Wall, S. D. The Vims Science Team, The Radar Science Team |
author_sort |
Crapeau, M. |
title |
Cassini/Altimeter and Vims Complementarity: Example Using Observations Over the Same Area From Ta and T13 Titan's Flybys |
title_short |
Cassini/Altimeter and Vims Complementarity: Example Using Observations Over the Same Area From Ta and T13 Titan's Flybys |
title_full |
Cassini/Altimeter and Vims Complementarity: Example Using Observations Over the Same Area From Ta and T13 Titan's Flybys |
title_fullStr |
Cassini/Altimeter and Vims Complementarity: Example Using Observations Over the Same Area From Ta and T13 Titan's Flybys |
title_full_unstemmed |
Cassini/Altimeter and Vims Complementarity: Example Using Observations Over the Same Area From Ta and T13 Titan's Flybys |
title_sort |
cassini/altimeter and vims complementarity: example using observations over the same area from ta and t13 titan's flybys |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.science/hal-00405629 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
2006DPS.38.4806C - Bulletin of the American Astronomical Society American Astronomical Society, DPS meeting #38, #48.06; https://hal.science/hal-00405629 American Astronomical Society, DPS meeting #38, #48.06;, 2006, United States. pp.575 |
op_relation |
hal-00405629 https://hal.science/hal-00405629 BIBCODE: 2006DPS.38.4806C |
_version_ |
1797582206462328832 |